5steel; 3 large holes 0.438 in. Diameter equally spaced on 1.500 in. Bolt circle diameter drilled to a depth of 0.219 in.; 6 small holes 0.250 in. Diameter unequally spaced on 0.875 in. Bolt circle dia; 0.375 in. Center bore dia; 2.000 in. Od; 0.562 in. O/a thk